A newly developed optimization based method is followed to locate the point of impact in anisotropic composite plates for which conventional triangulation technique fails. The new technique works for both anisotropic and isotropic plates. Experiments are carried out by dropping a steel ball on a...

The tensile deformation of anisotropic porous copper with unidirectionally oriented cylindrical pores was investigated by an acoustic emission method. In the loadings parallel and perpendicular to the orientation direction of the pores, many cracks are formed after yielding and they strongly...

The layered structure of slate rock induces strength anisotropy. The strength in the direction of the layers (schistosity) is considerably smaller than in any other direction. A series of loading tests on circular samples and another series of loading tests on rectangular samples are performed...

Two groups of cubic specimens from diaphysis of bovine femur, intact and completely demineralized, were axially compressed. One half of the samples from each group were loaded along the axis of the femur (L) and the other - perpendicularly (T). Intact samples were characterized in terms of...

A structural health monitoring technique for locating impact position in a composite plate is presented in this paper. The method employs a single sensor and spatial focusing properties of time reversal (TR) and inverse filtering (IF). We first examine the spatial focusing efficiency of both...

The experimental data obtained in a previous study are reprocessed to estimate the impact of several modifications of the measurement approach on the intrinsic longitudinal wave attenuation as a function of the propagation direction in reactor pressure vessel strip cladding. The measurement of...

Based on a simple second-order thin layer asymptotic expansion for the transfer matrix, an explicit asymptotic solution for the stiffness matrix for a generally anisotropic piezoelectric thin layer is obtained. The total transfer/stiffness matrix for thick layers or multilayers is calculated...

In this article are being presented the results of research on composite materials (CM) mechanical properties. The samples are of anisotropic reinforced plastics. Their shapes are conventional plates in shape of a cruciform and Maltese cross made for static - shear tests. The test program...

Experimental research is focused on the effect exerted by natural anisotropy orientation in some composites on the acoustic emission sensitivity of sensors. Acoustic emission is related with the angle of load application and lamination orientation in a composite. Based on cyclic test data, it is...